<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            height: 100vh;
            border: 1px solid yellow;
        }

        #box {
            width: 100px;
            height: 100px;
            border: 1px solid red;
            position: absolute;
        }
    </style>
</head>

<body>
    <div id="box"></div>
    <script src="main.js"></script>
</body>

</html>
